Explicit/implicit fluid/structure staggered procedures with a structural predictor and fluid subcycling for 2D inviscid aeroelastic simulations
✍ Scribed by Serge Piperno
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 470 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0271-2091
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✦ Synopsis
Field time integrators with second-order-accurate numerical schemes for both the ¯uid and the structure are considered for unsteady Euler aeroelastic computations. We show that if these schemes are simply coupled and used straightforwardly with subcycling, then accuracy and stability properties may be lost. We present new coupling staggered procedures where momentum conservation is enforced at the interface. This is done by using a structural predictor. Continuity of structural and ¯uid grid displacements is not satis®ed at the ¯uidastructure interface. However, we show on a two-degree-of-freedom aerofoil that this new type of method has many advantages, e.g. accuracy of conservation at the interface and extended stability. The supersonic ¯utter of a ¯at panel is simulated in order to numerically prove that the algorithm gives accurate results with arbitrary subcycling for the ¯uid in the satisfying limit of 30 time steps per period of coupled oscillation. # 1997